AIR POLLUTION CONTROL
Table I. Maximum Allowable Concen trations of Atmospheric Pollutants ( 7 3)
Pollutant
CHROMALOX Electric
IMMERSION HEATERS with or without built-in thermostats . . . Fit the heat to your need up to 100,000 watts and 2,500 psi Full range of sizes and ratings in portable, screw-plug and flanged types. Available with copper, steel or alloy sheaths to resist corrosion. Used for heating water, asphalt, greases, molten salts, pickling and plat ing baths, process kettles; for super heating steam and compressed air; for melting lead, solder, babbit; and for a wide range of similar applications. Let the Chromalox Sales-Engineering staff solve your heating problems... electrically.
Write for your copy of Catalog 50 —for full information on the complete line of Chromalox Electric Heaters and controls. For ideas on additional ap plications of electric heat, request Booklet F1550—"101 Ways to Apply Electric Heat."
Edwin L. Wiegand
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Company
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J EDWIN L WIEGAND COMPANY j j 7511 Thomas Boulevard, Pittsburgh 8, Pa. j j I would like to have . . . | I • a copy of Catalog 50 j • a copy of "101 Ways" • a Sales-Engineer contact me.
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NameCompanyStreet _Zone
Siate-
Circle No. 74 A on Readers' Service Card, page 139 A 74 A
0.03 O.S 6.0 0.5 0.1S
0.01 0.15 2.0 0.15 0.0003 0.05
0.75 0.30 0.05 0.5
0.0007 0.25 0.10 0.015 0.15
0.05
0.003 0.015
0.15
0.05
0.03 0.10
0.01 0.03
" These concentrations have been ap proved by the VGSI (Bureau of Sanitary Inspection, USSR). Remaining concen trations have been accepted by the com mission but not yet approved by the VGSI. 6 The norms for lead are not applicable to its organic compounds. '• The norms for the inorganic compounds of arsenic are not applicable to hydrogen arsenide. ment of sampling methods which could become more or less standard. " W h o will undertake this type of work? Unquestionably, some of the fundamental aspects of sampling could well become the subject of research for a national body, such as an appropriate federal agency or a university or research institution. It would seem unfortunate if each locality and each group working in air pollution should have to do this work in unnecessary duplication." Odor Measurements
7511 Thomas Boulevard, Pittsburgh 8, Pennsylvania
City
Formula
M a n g a n e s e and its compounds MnOj Nitrogen oxides" N2Os Carbon monoxide" CO Nontoxic dust" Metallic mercury" Hg Soot" Lead and its com pounds" •' Pb Sulfur dioxide" S02 Sulfuric acid H2S04 Hydrogen sulfide" H2S Carbon disulfide" CS 2 Arsenic compounds 0 (inorganic) As Phenol CHsOH Phosphoric anhydride P2Os Fluorine compounds F Chlorine" Cl
Concentration, Mg./Cu. M. Daily Single average
Measurements relating to odor con tinue to offer greater difficulties than many other determinations because of the subjective nature of odor detection. Research aspects of the nature of odor, its detection, and measurement have occupied wide attention and literature on this subject is growing (2, 5). A completed project of Committee D-22 on this subject is the Tentative Method for Determination of Concentration of Odor ous Vapors (D1354-55T) which has been published. In this method, the vapors are adsorbed on activated carbon and then removed for quantitative and qualitative analyses. Another method which actually involves odor measure ment and is referred to as the "dilution m e t h o d " has been developed by the committee and is designated A S T M Method D 1391-56T.
INDUSTRIAL A N D ENGINEERING CHEMISTRY
M a n y other methods are under active consideration in Committee D-22 and its subcommittees. It is expected that new and improved methods and defini tions will be produced by the committee at an increasing rate in the future. Its work has only just begun. Industry and Municipal Standard Methods A vast reservoir of standardized methods for possible consideration by A S T M Committee D-22 and other nationally recognized standards-writing bodies lies in the active files of industry and various municipal control groups. A good example of work in industry which might be construed as coming at least partially under the general heading of standardization is that carried out by the Manufacturing Chemists' Association under the auspices of the Air Pollution Abatement Committee. T h e M C A Air Pollution Abatement M a n u a l includes much worth-while information on such subjects as terminology, sampling pro cedures, and analytical methods. Its bibliography supplement includes a section of references on standards. O t h e r organizations, governmental and industrial, are doing similar work. T h u s standardization of a kind is wide spread, but often it is of a somewhat un official character. References (1) Am. Soc. Mech. Engrs., New York, "Example Sections for a Smoke Regulation Ordinance." Inform. Bull., 1949. (2) Am. Soc. Testing Materials, Sym posium on Odor, STP 164, 57th Annual Meeting, Chicago, 111., June 15, 1954. (3) Ibid., Yearbook, 1955. (4) Am. Standards Assoc, New York, American Standards Z37, "Allowa ble Concentrations of Toxic Dusts and Gases," 1941-9. (5) Ann. New York Acad. Sci. 58, 13-260 (1954). (6) Arch, of Ind. Hyg. and Occupational Med. 9, 530-4 (June 1954). (7) Barkley, J. F., U. S. Bureau of Mines Circ. 7682, May 1954. (8) J. Air Pollution Control Assoc, Manual APM 1-A, November 1955. (9) Mallette, F. S., Proc. Inst. Mech. Engrs. 168, No. 22 (1954). (10) McCabe, L. C , "Air Pollution," pp. 5, 11, 567, McGraw-Hill, New York, 1952. (11) Mech. Eng. 75, 712-14 (September 1953); Am. Soc. Mech. Engrs., "Guide to Research in Air Pollu tion," May 1955. (12) Philadelphia, Pa., Dept. of Public Health, City Bill No. 366, 1953. (13) Riazonov, V. Α., "Sanitary Safe guarding of Atmospheric Air," Official USSR Publishing Bureau, Moscow, 1954. (14) Smog News (Nov. 30, 1955). (15) U. S. Bureau of Mines, Setby Smelter Report, Bull. 98. (16) U. S. 84th Congress, Public Law 159.
